28 Apr
1999
28 Apr
'99
7:15 a.m.
Well, when I type .DIR it says
?ILL-CMD?
Right... no CCL or DCL...
and when I type .R DIR it says
?FIL-NOT-FND? (could have different vowels and consonants deleted)
DIR wasn't around at that time...
When I boot the disk it also asks for a
"Scratch" disk in drive 1, which
is promptly sets DX1=DK
Hmmm... I don't remember early versions of RT allowing command files.
That was something added later... *BUT*, it's possible that the
former owner made some modifications so that it does that at boot.
I remember adding CCL-like code to V2C when I was a student at
WPI back in the 70s...
Clearly the H27 floppies are RX01 clones although they
also have an
"extended" mode which may allow for double density operation.
More importantly they allow you to format disks :-)
Yep... I have a set myself...
Oh, and I tried an 11/23 CPU and it wouldn't boot,
it halts out with a
173xxx address.
Yeah, the 11/23 hadn't come along yet, so the code is pretty LSI-11/03
specific.
Megan Gentry
Former RT-11 Developer
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